You can take a pair of 6s down below 50% without much penalty in number of lifetime cycles, so that would be the first choice IMO. However once that low you can only run low amp draws, not the inverter which will alarm off depending on load and how far down you are in SOC.
LFP (and SiO2 within reason) will be happy to go to a low SOC and still keep the voltage up to allow the inverter to operate.
The real problem is recharging the batts of whatever type when they need it if you only have solar and it is overcast. We have no room for a portable gen in our TC, so that leaves running the truck. Low amp long time recharge not so good.
LFPs are not going to change that. You could still be sitting there with the batts out of AH and no sunshine. You might get an extra overcast day out of it with LFP, but then what? If you have a portable gen, you could have used it two days ago with your pair of 6s.
Seems the LFP option would make sense given the right scenario though.